Finding the Fourth Proportional to 111,510.71, 153,814.79 and 66,156.59

Step by Step Solution

1. Step 1: Write the proportion equation
   111,510.71 : 153,814.79 = 66,156.59 : x
2. Step 2: Convert to fraction form
   111,510.71/153,814.79 = 66,156.59/x
3. Step 3: Cross multiply
   111,510.71x = 153,814.79 × 66,156.59
4. Step 4: Simplify right side
   111,510.71x = 10,175,861,997.97
5. Step 5: Solve for x
   x = 10,175,861,997.97/111,510.71
6. Step 6: Final answer
   x = 91,254.57